Nachtrag: anscheinend ist die interne Batterie ein Akku.
Folgendes habe ich bei Sony US in einer Diskussion gefunden:
There is a big chance that the problemm here is the internal battery. Internal battery is responsible for maintaining the initial settings of the camera such as the date and time. You can try to power reset the camera to resolve the issue. Remove the battery from the camera, then switch the power for 30 seconds. Turn OFF the power and reinsert the battery. Camera should go back to initial Menu setup like setting the date and time. I would recommend leaving the camera OFF for 24 hours as this will recharge the internal battery.
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